Dhayi imusanganiswa weorganic, kazhinji kana paine mamiriro emvura kuti ipedzise reaction yemakemikari, saka dhayi rekutanga rekugadzira pasi rose rinotanga kutengeswa muchimiro chemvura, hongu, mhando yedhayi yekutanga ine chiyero chazvino iri kure, inogona kungoonekwa semhando yekutanga yedhayi yemvura nhasi. Panguva iyoyo, inenge 20% yezvinhu zvaive zvemvura, uye madhayi aya emvura aive madhayi eVAT nemadhayi emordant.

Muna 1923, maBritish akatanga kuwedzera zvimwe zvinhu zvakawedzerwa kudhayi rekutanga uye mushure mekukuya, vakagadzira dhayi risinganyunguduki rinopararira mumvura. Pakazosvika 1910, madhayi mazhinji akanga abviswa uye agadziriswa kuita hupfu hwakatsetseka hwehukuru hwakati.

Maererano nemabhuku egore ra1924, panguva iyoyo inenge 80% yedhayi inogadzirwa kuita upfu hwakatsetseka, madhayi eVAT akagadzirwa kuita mhando dzakasiyana dzezvinhu zvinogoverwa, kubva pahupfu hwakatsetseka kusvika ku50um. Asi dhayi rekutanga rine hupfu hwakashata nekuti harina guruva rakawanda uye harina kunyorova zvakanyanya.

Mushure megore ra1930, madhayi emhando yekupararira akawedzerwa kugadzirwa, asi kuchine zvimwe zvikanganiso zvakaita sekunaya kwemvura zviri nyore uye kusagadzikana kwekuchengetedza.

Iye zvino dhayi remvura mushure mekugadzirisa zvakanaka maitiro akasiyana-siyana avandudzwa zvakanyanya, nguva yekuchengetedza inogona kusvika anopfuura hafu yegore pasina kuora, mutengo wekugadzirisa dhayi remvura wakaderera, uri nyore kushandisa uye wagara uchigadzirwa.

Kubva muna 1950, kuburitswa kwemuchina wekukwesha kwakasimudzira kuvandudzwa kwetekinoroji yekurapa mushure mekunyorova. Kukwesha nemuchina wekukwesha kunogona kuita kuti zvidimbu zvitete uye zvitete zviwedzere kupfava. Pamusoro pezvo, fomura yekugadzirisa yakagadziriswa kuitira kuti zvidimbu zvedhayi zvisvike pa1um, uye mhando yezvigadzirwa zvakagadzirwa nemaitiro matsva nemichina yakagadziridzwa zvakanyanya, uye kugadziriswa kwedhayi dzisinganyungudike kwakafambira mberi zvikuru.

Nekufambira mberi kwemuchina wemakemikari nemidziyo yemakemikari, madhayi egranular akatanga kuoneka. Dhayi regranular rinoonekwa segranularity ye100 ~ 300 um, rine zvidimbu zvisina chinhu zvine zvidimbu zvakasimba, liquidity iri nani pane dhayi reupfu, kunyorova, kupararira, uye zvakare inokunda dambudziko reguruva reupfu rinoyangarara mudenga, mafomu emuyero akaonekwa pakarepo akagamuchirwa nedhipatimendi rekugadzira nekushandisa, ikozvino madhayi mazhinji akagadziriswa kuita zvigadzirwa zvegranular.